Warden Page 243 (Patreon)

Whisper does a metal band power pose.

When I consider who would be able to fight Prisoner in this field it would be Whisper, a dedicated scout unit. Of all the Custodians, she would have mental fortitude and anti-interrogation training. 

As mentioned last time, directly affecting the mind is inherently dangerous as it is a two way street. Normal mind mages and interrogators do not use it with any frequency. The difference between the Prisoner's version, is that his magic actually ties them closer than other types (which would be an emotional/thought bridge instead of experiencing vivid hallucinations). Which makes it more potent and real.